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Question

The mass of a neutral carbon atom, a specimen of the most common isotope, in ground state is

A
equal to 12 u
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B
less than 12 u
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C
more than 12 u
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D
Depends on the allotrope, whether it is graphite, charcoal or diamond.
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Solution

The correct option is A equal to 12 u
The unified atomic mass unit, 'u', is defined as '112th of the mass of a neutral Carbon-12 in its lowest energy state which contains six protons, six neutrons and six electrons.' So, by definition, a Carbon-12 atom in ground state has a mass of exactly 12 u.

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